package chapter10.login;

import java.sql.*;
import java.util.Scanner;

public class Login {
    /**
     * 模拟添加用户业务
     */
    public static void main(String[] args) throws SQLException {
        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username = "root";//数据库账户
            String password = "123456";
            conn = DriverManager.getConnection(url, username, password);
            /**
             * 终端用户登录
             */
            Scanner sc = new Scanner(System.in);
            System.out.println("用户登录");
            System.out.println("请输入你的姓名");
            String userName = sc.next();
            System.out.println("请输入你的密码");
            String userPwd = sc.next();
            String loginsql = "select  * from users where name=? and password=?";
            PreparedStatement pm = conn.prepareStatement(loginsql);
            pm.setString(1, userName);
            pm.setString(2, userPwd);
            rs = pm.executeQuery();//executeQuery返回多行数据 executeQuery()返回一个int
            //5. 显示结果集合
            System.out.println("id | name | password " + "| email |birthday");
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getNString("name");
                if (id > 0) {
                    System.out.println(name + "登录成功!");
                    break;
                }
            }
        }
        catch(ClassNotFoundException e){
                e.printStackTrace();
            }
        finally{
                //6.回收资源
                if (rs != null) {
                    try {
                        rs.close();
                    } catch (SQLDataException e) {
                        e.printStackTrace();
                    }
                    rs = null;
                }
                if (stmt != null) {
                    try {
                        stmt.close();
                    } catch (SQLDataException e) {
                        e.printStackTrace();
                    }
                    stmt = null;
                }
                if (conn != null) {
                    try {
                        conn.close();
                    } catch (SQLDataException e) {
                        e.printStackTrace();
                    }
                    conn = null;
                }
            }
        }
    }
